Corner key



FIG. 1 is a perspective view of a corner key.

FIG. 2 is a front elevation view of the corner key of FIG. 1.

FIG. 3 is a rear elevation view of the corner key of FIG. 1.

FIG. 4 is a right elevation view of the corner key of FIG. 1.

FIG. 5 is a left elevation view of the corner key of FIG. 1.

FIG. 6 is a top plan view of the corner key of FIG. 1; and,

FIG. 7 is a bottom plan view of the corner key of FIG. 1.

The broken lines depict portions of the corner key that form no part of the claimed design. 

CLAIM The ornamental design for a corner key, as shown and described. 